That signals the start of the three-minute interval.

If the child does not comply you may have to repeat the three-minute interval several times.

Boxing is supervised by a referee over a series of one- to three-minute intervals called rounds.

Twenty-two trains run on the line each day, at three-minute intervals.

"And we'll keep transmitting on our data-link at three-minute intervals in the event ."

In 15 point bouts, a 1-minute break occurs in between the three-minute intervals.

The metro service operates from 4-5 am until midnight, with about two- to three-minute intervals between trains during rush hours.

They activate with a bang at three-minute intervals and stay on for a minute.

Many of the dozens of people who spoke in three-minute intervals yesterday were familiar faces from years past.

Logistics: Considerable, with groups of 10 being ushered through the rooms at three-minute intervals.